The teenage sisters - who are aged 14 and 16 respectively - will feature in three spin-off programmes on the E! Network, which also airs the shows of their half-sisters Kim, Kourtney and Khloe; including 'Khloe and Kim Take New York'.

Kylie and Kendall have previously made brief appearances in family reality show 'Keeping Up With the Kardashians' but have not taken centre stage in their own programme before.

Bonnie Hammer, Chairman of NBCU Cable Entertainment and Cable Studios, said she was hoping for "two, three, even four new Kardashian spin-offs", with 'Dancing With The Stars' runner-up Rob Kardashian also being rumoured to be the focus of a new show.

Discussing the future of the Kardashian franchise, she added it would continue as long as it was relevant.

She added: "I think it will have its own life expectancy and we'll just go along with it and help hone what's right for E! and what's not right for E! as we develop a whole other world."